public/js: upgrade clipboard 1.5.9 to 2.0.4

public/assets/librejs/librejs.html

@@ -31,7 +31,7 @@
         <td><a href="/js/gogs.js">gogs.js</a></td>
       </tr>
       <tr>
-        <td><a href="/js/libs/clipboard-1.5.9.min.js">clipboard-1.5.9.min.js</a></td>
+        <td><a href="/js/libs/clipboard-2.0.4.min.js">clipboard-2.0.4.min.js</a></td>
         <td><a href="http://www.freebsd.org/copyright/freebsd-license.html">Expat</a></td>
         <td><a href="https://github.com/zenorocha/clipboard.js/archive/v1.5.9.tar.gz">clipboard-1.5.9.tar.gz</a></td>
       </tr>

public/js/gogs.js

@@ -1258,7 +1258,7 @@ $(document).ready(function () {
     }
 
     // Clipboard JS
-    var clipboard = new Clipboard('.clipboard');
+    var clipboard = new ClipboardJS('.clipboard');
     clipboard.on('success', function (e) {
         e.clearSelection();
 

templates/base/footer.tmpl

@@ -53,7 +53,7 @@
 	<script src="{{AppSubURL}}/plugins/autosize-4.0.2/autosize.min.js"></script>
 {{end}}
 <script src="{{AppSubURL}}/js/libs/emojify-1.1.0.min.js"></script>
-<script src="{{AppSubURL}}/js/libs/clipboard-1.5.9.min.js"></script>
+<script src="{{AppSubURL}}/js/libs/clipboard-2.0.4.min.js"></script>
 
 {{template "inject/footer" .}}
 </html>